be.SIRAPRISE.client
Interface Signer

All Known Implementing Classes:

DBObjectInterfaceGenerator, ProcessScript, UserPrivateKeyProvider

public interface Signer

Signers are used by clients in two circumstances :

• The client needs to establish a connection to a server and wants to authenticate itself
• The client needs to start a transaction for a non-anonymous user and wants/needs to authenticate the user identity by computing a signature

Author:

Erwin Smout

Method Summary

byte[]

sign(java.security.Signature signature, byte[] signMessage) Computes the signature for the given byte string and the given Signature.

Method Detail

sign

byte[] sign(java.security.Signature signature,
            byte[] signMessage)
            throws java.security.InvalidKeyException,
                   java.security.SignatureException,
                   NotFoundException

Computes the signature for the given byte string and the given Signature. Normally, this involves three method invocations on the given Signature object :

• initSign() the Signature with a PrivateKey object which is to be obtained from private resources
• update() the Signature with the given byte string
• sign() to compute the signature bytes

Parameters:

signature - The Signature object to be used for computing the signature.

signMessage - The message to be signed.

Returns:

the computed signature

Throws:

java.security.InvalidKeyException - If the private key found for signing with this Signature, turns out to be invalid

java.security.SignatureException - If any problem occurred during computation of the signature

NotFoundException - If no private key could be found for signing with this Signature